Performance of a treatment system for inorganic nitrogen removal in intensive aquaculture systems

1995 ◽  
Vol 14 (2) ◽  
pp. 189-203 ◽  
Author(s):  
Roy Arbiv ◽  
Jaap van Rijn
Keyword(s):  
Nitrogen Removal ◽  
Inorganic Nitrogen ◽  
Treatment System ◽  
Intensive Aquaculture

scholarly journals Nitrification–denitrification in waste stabilisation ponds: a mechanism for permanent nitrogen removal in maturation ponds

2010 ◽  
Vol 61 (5) ◽  
pp. 1137-1146 ◽  
Author(s):  
M. A. Camargo Valero ◽  
L. F. Read ◽  
D. D. Mara ◽  
R. J. Newton ◽  
T. P. Curtis ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Inorganic Nitrogen ◽  
Isotope Analysis ◽  
Pilot Scale ◽  
Intermediate Step ◽  
Nitrogen Transformations ◽  
Waste Stabilisation Ponds ◽  
Molecular Microbiology ◽  
Denitrification Process ◽  
Ammonia Oxidising Bacteria

A pilot-scale primary maturation pond was spiked with 15N-labelled ammonia (15NH4Cl) and 15N-labelled nitrite (Na15NO2), in order to improve current understanding of the dynamics of inorganic nitrogen transformations and removal in WSP systems. Stable isotope analysis of δ15N showed that nitrification could be considered as an intermediate step in WSP, which is masked by simultaneous denitrification, under conditions of low algal activity. Molecular microbiology analysis showed that denitrification can be considered a feasible mechanism for permanent nitrogen removal in WSP, which may be supported either by ammonia-oxidising bacteria (AOB) or by methanotrophs, in addition to nitrite-oxidising bacteria (NOB). However, the relative supremacy of the denitrification process over other nitrogen removal mechanisms (e.g., biological uptake) depends upon phytoplanktonic activity.

Unconventional microbial mechanisms for the key factors influencing inorganic nitrogen removal in stormwater bioretention columns

2021 ◽  
pp. 117895
Author(s):  
Liuqin Huang ◽  
Junyue Luo ◽  
Linxin Li ◽  
Hongchen Jiang ◽  
Xiaoxi Sun ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Inorganic Nitrogen ◽  
Key Factors ◽  
Factors Influencing

scholarly journals Impact of mixing intensity on dissolved oxygen half-velocity constants in a sidestream deammonification environment

2019 ◽  
Vol 55 (2) ◽  
pp. 145-154
Author(s):  
Biao Xie ◽  
Chao Jin ◽  
Wayne J. Parker
Keyword(s):  
Dissolved Oxygen ◽  
Nitrogen Removal ◽  
Inorganic Nitrogen ◽  
Bulk Phase ◽  
Batch Reactors ◽  
Ammonia Oxidizing Bacteria ◽  
Mixing Conditions ◽  
Steady State Operation ◽  
Mixing Intensity ◽  
Best Fit

Abstract A partial nitritation/anammox (PN/A) process was operated at two different mixing intensities to quantify the extent to which diffusional limitations impact process rates. At a steady-state operation, the total inorganic nitrogen removal efficiency in the bench-scale sequencing batch reactors was found to increase as mixing intensity decreased (62 and 84% for average velocity gradient (G) values of 15 and 5.3 s−1, respectively). The half-velocity constants with respect to bulk-phase dissolved oxygen (DO) concentration for ammonia-oxidizing bacteria (AOB) and anaerobic ammonium-oxidizing (anammox) organisms were estimated on the basis of nitrogen removal rates that were observed in activity tests. The activity tests were conducted over a range of bulk-phase DO concentrations. The best-fit values were estimated to be 0.68 ± 0.34 and 0.54 ± 0.56 mg O2/L for G values of 15 and 5.3 s−1, respectively. The AOB values were not statistically different (p = 0.19) between mixing conditions which were consistent with AOB dominating the surface of granules. The best-fit values were estimated to be 0.13 ± 0.09 and 0.55 ± 0.40 mg O2/L for G values of 15 and 5.3 s−1, respectively, and were statistically different . The results demonstrated that mixing conditions should be considered when designing PN/A processes and provide quantitative results that can be employed to improve models of these processes. This article has been made Open Access thanks to the kind support of CAWQ/ACQE (https://www.cawq.ca).

Modeling nitrogen removal in a constructed wetland treatment system

2009 ◽  
Vol 60 (2) ◽  
pp. 301-309 ◽  
Author(s):  
P. G. Sonavane ◽  
G. R. Munavalli
Keyword(s):  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Kinetic Models ◽  
Plant Uptake ◽  
Field Experiments ◽  
Treatment System ◽  
Effective Control ◽  
Distributed Parameter ◽  
Distributed Parameter Model ◽  
Wetland Treatment

A constructed wetland treatment system (CWTS) has been adopted for removal of nitrogen from wastewater. The design methodologies developed for CWTS in previous studies were based on thumb rules, and first order/Monod type kinetics models. The use of kinetic models is system/environment specific. There is scope to assess the potential of other reaction kinetic models for their usefulness and applicability. In the present study, lumped and distributed parameter models incorporated with various reactions kinetic were developed. The various processes were incorporated in distributed parameter model for nitrogen transformations. Laboratory/pilot-scale field experiments were carried out and used for verification and application of models developed. The reaction rate parameters were estimated using non-linear least square analysis. The results showed that the conditions within CWTS can be simulated by plug flow. The plant uptake rate was found to be higher than denitrification for nitrate removal. Nitrification and plant uptake are equally dominant for the removal of ammonia nitrogen. The relative contributions by various processes for nitrogen removal can be established using the distributed parameter model. The developed simulation model can be used as a CWTS planning and design tool for the effective control and treatment of nitrogen induced pollution.

scholarly journals Integrated Low-Energy and Low Carbon Shortcut Nitrogen removal with Biological Phosphorus Removal for Sustainable Mainstream Wastewater Treatment

2019 ◽  
Author(s):  
Paul Roots ◽  
Fabrizio Sabba ◽  
Alex F. Rosenthal ◽  
Yubo Wang ◽  
Quan Yuan ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Inorganic Nitrogen ◽  
Ex Situ ◽  
Nitrous Oxide Emissions ◽  
Biological Phosphorus Removal ◽  
Removal Rates ◽  
Total N ◽  
Biological Phosphorus ◽  
P Removal

AbstractWhile enhanced biological phosphorus removal (EBPR) is widely utilized for phosphorus (P) removal from wastewater, understanding of efficient process alternatives that allow combined biological P removal and shortcut nitrogen (N) removal, such as nitritation-denitritation, is limited. Here, we demonstrate efficient and reliable combined total N, P, and chemical oxygen demand removal (70%, 83%, and 81%, respectively) in a sequencing batch reactor (SBR) treating real mainstream wastewater (primary effluent) at 20°C. Anaerobic – aerobic cycling (with intermittent oxic/anoxic periods during aeration) was used to achieve consistent removal rates, nitrite oxidizing organism (NOO) suppression, and high effluent quality. Importantly, high resolution process monitoring coupled to ex situ batch activity assays demonstrated that robust biological P removal was coupled to energy and carbon efficient nitritation-denitritation, not simultaneous nitrification-denitrification, for the last >400 days of 531 total days of operation. Nitrous oxide emissions of 2.2% relative to the influent TKN (or 5.2% relative to total inorganic nitrogen removal) were similar to those measured in other shortcut N bioprocesses. No exogenous chemicals were needed to achieve consistent process stability and high removal rates in the face of frequent wet weather flows and highly variable influent concentrations. Process modeling reproduced the performance observed in the SBR and confirmed that nitrite drawdown via denitritation contributed to suppression of NOO activity.

scholarly journals Newly established process combining partial hydrogenotrophic denitrification and anammox for nitrogen removal

2020 ◽  
Vol 82 (7) ◽  
pp. 1272-1284
Author(s):  
Kenta Shinoda ◽  
Rawintra Eamrat ◽  
Yuya Tsutsumi ◽  
Suphatchai Rujakom ◽  
Tippawan Singhopon ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Production Efficiency ◽  
Inorganic Nitrogen ◽  
Amplicon Sequencing ◽  
Ammonium Nitrogen ◽  
Great Promise ◽  
Rrna Gene ◽  
Ammonium Oxidation ◽  
Initial Ph ◽  
Anammox Process

Abstract The anaerobic ammonium oxidation (anammox) process holds great promise for treating nitrogen-contaminated water; stable nitrite-nitrogen (-N) production is significant to anammox performance. In this study, partial hydrogenotrophic denitrification (PHD) was used to stably and efficiently produce -N from nitrate-nitrogen (-N). An investigation of the effects of initial pH on the PHD process revealed that a high -N production efficiency (77.9%) could be ensured by setting an initial pH of 10.5. A combined PHD-anammox process was run for more than three months with maximal ammonium-nitrogen (-N), -N, and total dissolved inorganic nitrogen removal efficiencies of 93.4, 98.0, and 86.9%, respectively. The -N to -N and -N to -N ratios indicated that various bioprocesses were involved in nitrogen removal during the anammox stage, and a 16S rRNA gene amplicon sequencing was performed to further clarify the composition of microbial communities and mechanisms involved in the nitrogen removal process.

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